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doi:10.1002/jbio.v2:10

Cited by 22 publications

(9 citation statements)

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“…This requires both linearly and circularly polarized light independent measurements (no less than 16) to be provided. For many medical diagnostic applications, more robust techniques are preferable; thus, the approach introduced by Gupta et al, 110,197,198 which is based exclusively on linear polarization measurements, has a good perspective. These authors suggest the use of a (3 × 3) partial Mueller matrix, containing only the first three rows and columns of the conventional (4 × 4) matrix.…”

Section: Linear Polarization Measurements: 3 × 3 Partial Mueller Matrixmentioning

confidence: 99%

“…The decomposition procedure of the experimentally obtained (3 × 3) Mueller matrix M as the product of diattenuation (M D ), retardation (M R ), and depolarization (M Δ ) matrices is described in detail. 110,197,198 The measured Mueller matrix can be expressed as 198 E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 6 9 ; 3 2 6 ; 5 5 4…”

Section: Linear Polarization Measurements: 3 × 3 Partial Mueller Matrixmentioning

confidence: 99%

“…The measurement of polarization parameters (linear retardance, diattenuation, and depolarization) of normal and malignant tissue from human oral cavity and breast over the spectral range from 390 to 550 nm was reported. 198 Also, multispectral (3 × 3) Mueller matrix imaging was performed over a spectral range from 470 to 632 nm for 4-μm unstained gastric tissue sections. 199 In this study, the combination of linear depolarization and linear retardance yields the highest accuracy in sample classification.…”

Section: Linear Polarization Measurements: 3 × 3 Partial Mueller Matrixmentioning

confidence: 99%

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Polarized light interaction with tissues

2016

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This tutorial-review introduces the fundamentals of polarized light interaction with biological tissues and presents some of the recent key polarization optical methods that have made possible the quantitative studies essential for biomedical diagnostics. Tissue structures and the corresponding models showing linear and circular birefringence, dichroism, and chirality are analyzed. As the basis for a quantitative description of the interaction of polarized light with tissues, the theory of polarization transfer in a random medium is used. This theory employs the modified transfer equation for Stokes parameters to predict the polarization properties of single- and multiple-scattered optical fields. The near-order of scatterers in tissues is accounted for to provide an adequate description of tissue polarization properties. Biomedical diagnostic techniques based on polarized light detection, including polarization imaging and spectroscopy, amplitude and intensity light scattering matrix measurements, and polarization-sensitive optical coherence tomography are described. Examples of biomedical applications of these techniques for early diagnostics of cataracts, detection of precancer, and prediction of skin disease are presented. The substantial reduction of light scattering multiplicity at tissue optical clearing that leads to a lesser influence of scattering on the measured intrinsic polarization properties of the tissue and allows for more precise quantification of these properties is demonstrated.

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Section: Linear Polarization Measurements: 3 × 3 Partial Mueller Matrixmentioning

confidence: 99%

Section: Linear Polarization Measurements: 3 × 3 Partial Mueller Matrixmentioning

confidence: 99%

Section: Linear Polarization Measurements: 3 × 3 Partial Mueller Matrixmentioning

confidence: 99%

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Polarized light interaction with tissues

2016

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“…Due to the potential of polarimetry imaging in cancer diagnosis, various approaches have been proposed to acquire data rapidly and derive polarimetry parameters. Manhas et al 12 developed a system to obtain 3 × 3 Mueller matrix and demonstrated that the values of all linear polarization parameters, i.e., linear retardance, linear depolarization (LD), and linear diattenuation, in normal oral cavity tissues were higher than cancerous tissues at wavelengths ranging from 400 to 550 nm. This observation was the opposite of that in breast tissues based on their results.…”

Section: Introductionmentioning

confidence: 99%

Roles of linear and circular polarization properties and effect of wavelength choice on differentiation betweenex vivonormal and cancerous gastric samples

et al. 2014

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Multispectral Mueller matrix imaging was performed over a spectral range from 470 to 632 nm on 4-μm unstained gastric tissue sections. A complete set of polarization parameters was derived. The combination of linear depolarization and linear retardance yields the highest accuracy in sample classification. When the depolarization of linearly polarized light due to scattering is independent of the orientation angle of the incident linear polarization vector, the derivation of linear polarization properties will require only 3×3 Mueller matrix, which would significantly reduce the complexity of the polarimetry imaging system. When additional parameters are needed to complement the two linear polarization parameters, retardance, circular depolarization, and depolarization can be included in classification in the order of preference. However, these additional parameters would require the measurement of 4×4 Mueller matrix. In addition, it appears that wavelength is not a critical factor in terms of classification accuracy for thin tissue sections in this study.

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“…[1][2][3][4] A number of studies have been done to characterize bone tissue ablation with various of wavelengths and pulse durations. [5][6][7][8][9][10][11][12][13] Since the wavelengths of CO 2 (9.3 to 10.6 μm), Er:YAG (2.94 μm), and Er,Cr:YSGG (2.78 μm) lasers coincide with the strong absorption peaks of two main components of bone tissue-that is, hydroxyapatite (65% of the weight of bone) and water (10 to 15% of the weight of bone)-they are the most suitable candidates for bone surgery. 7,13,14 The primary mechanism reported for IR lasers is thermomechanical: light absorption by water and/or mineral bone components in thin tissue layer could heat interstitial water and lead to internal pressure that reaches the ultimate tensile strength of the tissue, consequently resulting in explosive removal of the outer layers of bone tissue.…”

Section: Introductionmentioning

confidence: 97%

Influence of water layer thickness on hard tissue ablation with pulsed CO[sub 2] laser

et al. 2012

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The theory of hard tissue ablation reported for IR lasers is based on a process of thermomechanical interaction, which is explained by the absorption of the radiation in the water component of the tissue. The microexplosion of the water is the cause of tissue fragments being blasted from hard tissue. The aim of this study is to evaluate the influence of the interdependence of water layer thickness and incident radiant exposure on ablation performance. A total of 282 specimens of bovine shank bone were irradiated with a pulse CO(2) laser. Irradiation was carried out in groups: without a water layer and with a static water layer of thickness ranging from 0.2 to 1.2 mm. Each group was subdivided into five subgroups for different radiant exposures ranging from 18 to 84 J/cm(2), respectively. The incision geometry, surface morphology, and microstructure of the cut walls as well as thermal injury were examined as a function of the water layer thickness at different radiant exposures. Our results demonstrate that the additional water layer is actually a mediator of laser-tissue interaction. There exists a critical thickness of water layer for a given radiant exposure, at which the additional water layer plays multiple roles, not only acting as a cleaner to produce a clean cut but also as a coolant to prevent bone heating and reduce thermal injury, but also helping to improve the regularity of the cut shape, smooth the cut surface, and enhance ablation rate and efficiency. The results suggest that desired ablation results depend on optimal selection of both water layer thickness and radiant exposure.

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Cited by 22 publications

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Polarized light interaction with tissues

Polarized light interaction with tissues

Roles of linear and circular polarization properties and effect of wavelength choice on differentiation betweenex vivonormal and cancerous gastric samples

Influence of water layer thickness on hard tissue ablation with pulsed CO[sub 2] laser

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